Can't you just delete some of the ini files and then in Steam check integrity to reset values to standard?

Thanks Cheesecake, thanks for all your help. JM.

Just one more question before i end this post, I have a purched DVD copy of COD, could I uninstall the version that is proving a problem and reinstall the original default version and start from scratch. Will this rewrite any files that may reside with Steam

Cheers and thanks again. JM.